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United States Patent |
5,131,443
|
Kuhr
,   et al.
|
July 21, 1992
|
Tread design for a pneumatic vehicle tire
Abstract
A tread design for a pneumatic tire of radial construction for high-speed
vehicles is provided. The tread design comprises profiled elements that
are steeply oriented in the circumferential direction at an angle to the
equatorial plane of the tire and are arranged in the shape of V's. The
profiled elements extend in a continuous manner from a central portion of
the tread into shoulder regions of the tire and are angled-off at a bend
region in these shoulder regions. Respective continuous, inclined grooves
that proceed from the central portion of the tread to the shoulder regions
are formed between the profile elements. Respective fork-shaped elements
are provided in the shoulder regions in the vicinity of ends of the
profiled elements remote from the central portion of the tread, with each
fork-shaped element being provided with at least one short groove that
opens into the shoulder region away from the bend region thereof.
Inventors:
|
Kuhr; Wolfgang (Aachen, DE);
Zinnen; Norbert (Aachen, DE)
|
Assignee:
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Uniroyal Englebert Reifen GmbH (Aachen, DE)
|
Appl. No.:
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639652 |
Filed:
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January 10, 1991 |
Foreign Application Priority Data
Current U.S. Class: |
152/209.28; 152/209.19; D12/563 |
Intern'l Class: |
B60C 011/04 |
Field of Search: |
152/209 R,209 D,209 B
D12/146,147,149
|
References Cited
U.S. Patent Documents
1127517 | Feb., 1915 | Richardson | 152/209.
|
3457981 | Jul., 1969 | Verdier | 152/209.
|
4057089 | Nov., 1977 | Johannsen | 152/209.
|
4687037 | Aug., 1987 | Pfeiffer et al. | 152/209.
|
Foreign Patent Documents |
0880418 | Mar., 1943 | FR | 152/209.
|
0090405 | Apr., 1988 | JP | 152/209.
|
2229974 | Oct., 1990 | GB | 152/209.
|
Other References
"Der Reifen der nicht baden geht"; Auto Bild, Oct. 22, 1990.
"Die ganz andere Problemlosung"; Produkte, Oct. 1990, pp. 94-98.
|
Primary Examiner: Ball; Michael W.
Assistant Examiner: Krawczyk; Nancy T.
Attorney, Agent or Firm: Robert W. Becker & Associates
Claims
What we claim is:
1. In a pneumatic tire of radial construction for high-speed vehicles, with
said tire having a height-to-width ratio of .ltoreq.0.6, and furthermore
having a belt-reinforced tread portion with a tread design that is tied to
the direction of rotation and comprises profiled elements that are steeply
oriented in the circumferential direction at an angle to an equatorial
plane of said tire and are arranged in the shape of V's, with said
profiled elements extending in a continuous manner from a central portion
of said tread into shoulder regions of said tire, with said profiled
elements being angled-off at a bend region in said shoulder regions in the
direction of an axis of said tire, and with respective continuous,
inclined grooves that proceed from said central portion of said tread to
said shoulder regions being formed between said profiled elements, the
improvement wherein:
respective fork-shaped means are provided in said shoulder regions in the
vicinity of ends of said profiled elements remote from said central
portion of said tread, with each of said fork-shaped means being provided
with at least one short groove that opens into said shoulder region away
from said bend region thereof.
2. A tread design according to claim 1, which includes a zig-zagged
circumferential groove that is disposed in said central portion of said
tread and from which said profiled elements and inclined grooves extend
toward either side.
3. A tread design according to claim 1, in which said profiled elements are
rune-shaped and, between said central portion of said tread and said bend
regions, extend at an angle of 5.degree. to 25.degree. relative to said
equatorial plane, in the region of which starting portions of said
profiled elements have the shape of V's, with said starting portions being
staggered relative to one another in a circumferential direction.
4. A tread design according to claim 1, in which said fork-shaped means are
formed by said ends of said profiled elements that are remote from said
central portion of said tread.
5. A tread design according to claim 4, in which each of said fork-shaped
ends of said profiled elements is provided with one short groove that
opens into said shoulder region.
6. A tread design according to claim 4, in which each of said fork-shaped
ends of said profiled elements is provided with two short grooves that
open into said shoulder region.
7. A tread design according to claim 4, which includes, between each of
said fork-shaped ends of said profiled elements, at least one short rib
that is disposed in said inclined groove and extends from said bend region
into said shoulder region.
8. A tread design according to claim 1, in which said fork-shaped means are
formed by separate elements respectively disposed in said inclined grooves
between each of said ends of said profiled elements that are remote from
said central portion of said tread, with each said separate element being
provided with one short groove that opens into said shoulder region.
9. A tread design according to claim 1, in which said fork-shaped means are
formed not only by ends of said profiled elements that are remote from
said central portion of said tread, but also by separate elements
respectively disposed between each of said fork-shaped ends of said
profiled elements.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a tread design for a pneumatic tire of
radial construction for high-speed vehicles, with the tire having a
height-to-width ratio of .ltoreq.0.6. These vehicle tires have a
belt-reinforced tread portion with a tread design that is tied to the
direction of rotation. The tread design comprises profiled elements that
are steeply oriented in the circumferential direction at an angle to the
equatorial plane of the tire and are arranged in the shape of V's, with
the tips of the V's facing in the direction of normal travel of the tire.
The profiled elements extend in a continuous manner from the central
portion of the tread into shoulder regions of the tire, with the profiled
elements being angled-off at a bend region in the shoulder regions in a
direction that is more or less parallel to the axis of the tire.
Respective continuous inclined grooves are formed between the profiled
elements and proceed from the central portion of the tread to the shoulder
regions, with these inclined grooves being steeply oriented in the central
portion of the tread relative to the equatorial plane of the tire, and in
the shoulder region being oriented in the direction of the axis of the
tire.
Tread designs are known where continuous inclined grooves extend from the
shoulder regions of the tire to the central portion of the tread, where
they end in a blind manner. Tread designs are also known where the
inclined grooves of one half of the tread are connected with the inclined
grooves of the other half of the tread in the central portion of the tire.
With wide tires where the inclined grooves are arranged in the shape of
V's, in order to have an effective drainage and to prevent aquaplaning
during a braking operation, it is expedient to provide a steep orientation
of the inclined grooves in the circumferential direction. At the same
time, continuous drainage via the inclined grooves into the open shoulder
regions of the tire should be ensured. Furthermore, for reasons of wear
and noise emission at high vehicle speeds, not only in the central portion
but also in the shoulder regions wide tires should have a relatively high
positive profile proportion in the form of profiled elements. The tread
profile should be such that the requirements for low wear and a low noise
level can also be fulfilled.
It is therefore an object of the present invention to embody and dispose
the profiled elements in the shoulder regions of the tire in such a way
that it is possible to achieve an effective drainage, a relatively high
resistance to skidding in the wet, and a relatively quiet operation, as
well as a uniform and low wear over the width of the tread.
BRIEF DESCRIPTION OF THE DRAWINGS
This object, and other objects and advantages of the present invention,
will appear more clearly from the following specification in conjunction
with the accompanying schematic drawings, in which:
FIG. 1 illustrates one exemplary embodiment of the inventive tread design,
which shows steeply oriented profiled elements that are arranged in the
shape of V's; and
FIG. 2-4 illustrate further exemplary embodiments of the shoulder profiling
of the inventive tread design.
SUMMARY OF THE INVENTION
The tread design of the present invention is characterized primarily by
respective fork-shaped means that are disposed in the shoulder regions in
the vicinity of ends of the profiled elements. The tread design
furthermore comprises rune-shaped profiled elements that are disposed in
the shape of V's at a steep orientation angle of from 5.degree. to
25.degree. , whereby tips of the profiled elements in the central portion
of the tread are offset relative to one another in the circumferential
direction of the tire.
The shoulder regions, in the vicinity of the ends of the profiled elements
remote from the central portion of the tread, are provided with respective
portions comprising a plurality of ribs, and at least one blind groove,
that have a short axial length and that alternate in a circumferential
direction, thereby producing respective fork shaped means in the shoulder
regions.
The configuration of the fork-shaped means in the shoulder region is such
that at least one additional blind-ended shoulder groove is provided.
The rune-shaped profiled elements, along with the fork-shaped shoulder
elements, form a wide tire profile that is resistant to wet skidding, is
effective with respect to drainage, and is resistant to wear. The
continuous inclined grooves, which extend parallel to the steeply oriented
profiled elements and communicate in the central portion of the tread with
inclined grooves of the other half of the tread with which they
respectively abut, ensure a relatively effective drainage. Thus,
continuity is ensured from the steeply disposed inclined grooves from the
central portion of the tread to the angled-off arrangement that extends
essentially parallel to the axis of the tire. As a consequence of this
inventive tread design, if the wheels become locked during a braking
operation water that is present can still flow off into the inclined
grooves, thus preventing the danger of aquaplaning during a braking
operation.
The width of the fork-shaped profiled elements and the rune-shaped profiled
elements is a function of the circumferential interval or division of the
tread profile. The width of the rune-shaped profiled elements and the
width of the inclined grooves are such that a negative/positive ratio is
provided where the positive proportion is approximately 60%. This has a
positive impact upon the development of noise. As a result of the
fork-shaped elements, the shoulder profile provides a high proportion of
favorably low shoulder wear and a favorably high water-removal capability.
Pursuant to further specific embodiments of the present invention, it is
possible to additionally provide as part of the forked shoulder
configuration a further blind-ended groove and/or a short rib.
It is to be understood that the inventive features also encompass the
reverse configuration, where instead of profiled elements profiled grooves
are provided, and in place of the profiled grooves, profiled elements are
provided.
Further specific features of the present invention will be described in
detail subsequently.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings in detail, the tread design 1 of FIG. 1,
which is intended for a wide tire having a height-to-width ratio of
.ltoreq.0.6, comprises a plurality of shaped or profiled elements 2 and 3
that are arranged in the shape of V's. The profiled elements 2 are
disposed in one half of the tread, while the profiled elements 3 are
disposed in the other half of the tread.
Disposed in the vicinity of the equatorial plan x--x are the starts or tips
2', 3'of the profiled elements 2, 3. In the circumferential direction,
these profiled element starts are offset relative to one another and as a
result form a continuous, zig-zagged circumferential groove 4 that is
disposed in the central portion of the tread. The direction of normal
travel is designated by the reference symbol L, and the width of the tire
support is designated by the reference symbol A.
The profiled elements 2, 3 are disposed at a relatively steep angle of
15.degree., relative to the equatorial plane x--x. As a consequence, the
tread design for the wide tire has a very distinct or pronounced
circumferential orientation. This tread design is provided in the central
portion with a system of elongated continuous ribs that form a significant
constituent of the profiled elements 2 3. The profiled elements have a
rune-shaped configugation; in other words, they have the shape of a
slender, elongated rib with a bend region 5 or 6 disposed at the end.
Proceeding from these bend regions, the profiled elements extend at an
angle .beta. of 70.degree. and at a slight angle to a line parallel to the
axis of the tire. The distance "k" between the bend regions 5 and 6 of the
tread is, for wide tires having a height-to-width ratio of 0.6, between 60
and 70% of the tire support width A; in the illustrated embodiment, the
distance "k" is 67% of the support width A.
Formed between respective profiled elements 2 3 are elongated, continuous
profiled grooves 7 and 8 that have a relatively steep circumferential
orientation. These profiled grooves proceed from the common zig-zagged
circumferential groove 4, extend linearly and steeply oriented at the
angle .alpha. to the bend regions 5 or 6, and extend from here at the
angle .beta., and at an angle to a line that is parallel to the axis of
the tire, and into the open tire shoulders 9 or 10.
The design of the tread in the shoulder portion is split by a forking into
two ribs 11, between which is disposed a short, blind-ended groove 12.
The width B of the profiled elements 2, 3 is, for example, 13 to 20 mm. The
width S of the shoulder design is up to 3 times greater than the width B.
The groove width is, for example, 8 to 11 mm, and is a function of, among
other things, the angle .alpha. and the circumferential interval or
division "t".
As a consequence of the inventive tread design for wide tires having a
height-to-width ratio of 0.6 and less, where the tread design is formed of
steep profiled elements that are disposed in the shape of V's and have a
shoulder bend, on the one hand a very great resistance to skidding in the
wet and an effective drainage are provided, and on the other hand a very
great wear stability or resistance and a relatively low development and
emission of noise are provided.
In order to further improve the drainage and the strength in the tire
shoulders, as shown in the embodiment of FIG. 2 each of the profiled fork
portions 21 of the tread design 20 is provided with two short grooves 22
that are provided in addition to the inclined groove 23.
As shown in the embodiment of FIG. 3, disposed between adjacent profiled
fork portions 25 are respective short ribs 24. This short rib 24 divides
the inclined groove 26 into two partial grooves 26', 26". The short rib 24
proceeds from the bend regions and extends into the shoulders.
In the embodiment of FIG. 4, rune-shaped profiled elements SO are provided
that have no fork portions in the shoulder. In this embodiment, a
construction that corresponds to a forked member is provided via the
interposition of a short rib 27 that has a short groove 28. In this way,
the inclined groove 29 is again divided into two partial grooves 29', 29".
If necessary, various ones of the profiled shoulder fork configurations
can be combined in order to further improve the drainage and the shoulder
wear properties. It is to be understood that where required for the
profile division, the width B of the rune-shaped profiled elements can
vary from element to element.
The present invention is, of course, in no way restricted to the specific
disclosure of the specification and drawings, but also encompasses any
modifications within the scope of the appended claims.
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